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Related Concept Videos

Peroxisomes01:24

Peroxisomes

Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...
Peroxisomes01:30

Peroxisomes

Peroxisomes and mitochondria are two important oxygen-utilizing organelles in eukaryotic cells. Mitochondria carry out cellular respiration—the process that converts energy from food into ATP. Peroxisomes carry out a variety of functions, primarily breaking down different substances, such as fatty acids.The peroxisome is a single membrane-bound cellular organelle that can perform several different functions, including lipid metabolism and chemical detoxification. The enzymes within peroxisomes...
Peroxisomes01:24

Peroxisomes

Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...
Oxidation of Phenols to Quinones01:17

Oxidation of Phenols to Quinones

In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox property is crucial in...
Redox Reactions01:27

Redox Reactions

Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
Redox Reactions01:24

Redox Reactions

Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...

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In vivo Imaging Method to Distinguish Acute and Chronic Inflammation
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Peroxiredoxin: a central player in immune modulation.

M W Robinson1, A T Hutchinson, J P Dalton

  • 1Institute for the Biotechnology of Infectious Diseases (IBID), University of Technology Sydney (UTS), Ultimo, Sydney, NSW, Australia.

Parasite Immunology
|May 27, 2010
PubMed
Summary

Helminth-secreted peroxiredoxins (Prx) are antioxidants that protect parasites from host immunity. These Prx also promote immune responses, specifically Th2-responses, by activating macrophages.

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Area of Science:

  • Immunology
  • Parasitology
  • Biochemistry

Background:

  • Peroxiredoxins (Prx) are antioxidant enzymes crucial for cellular defense against reactive oxygen species (ROS).
  • Parasitic helminths secrete Prx, suggesting a role in evading host immune defenses, particularly ROS.
  • Recent findings indicate helminth Prx actively modulate host immune responses.

Purpose of the Study:

  • To review the multifaceted roles of helminth-secreted peroxiredoxins (Prx).
  • To explore how Prx contribute to parasite survival and host immune modulation.
  • To discuss the involvement of Prx in inducing T-helper 2 (Th2) immune responses.

Main Methods:

  • Literature review of studies on peroxiredoxins in parasitic helminths.
  • Analysis of mechanisms by which helminth Prx interact with host immune cells.
  • Discussion of experimental evidence linking Prx to macrophage activation and Th2 responses.

Main Results:

  • Helminth-secreted Prx confer protection against host-derived ROS.
  • Prx from helminths induce alternatively activated macrophages.
  • This macrophage activation promotes the development of Th2-type immune responses.

Conclusions:

  • Helminth-secreted Prx are key molecules in parasite-host immune interactions.
  • Beyond antioxidant functions, Prx actively shape host immunity towards Th2 profiles.
  • Understanding Prx roles is vital for developing novel anti-parasitic strategies.